Utilizing the exhaust of engines



(No Model.)

I D. RBNSHAW. UTILIZING THE EXHAUST QF ENGINES;

No. 274,971. Patented Apr. 8 1883.

TENS. Phoivlilbugnpher. Whhinglun. D C

UNITE STATES ATENT, OFFICE.

DAVID RENSHAW, OF BRAINTREE, MASSACHUSETTS.

UTILIZING THE EXHAUST OF ENGINES.

SPECIFICATION forming part of Letters Patent No. 274,971, dated April 3,1883.

Application filed February 16, 1883. (No model.)

To all whom it may concern:

Be it known that I, DAVID RENSHAW, of Braintree, in the county ofNorfolk and State of Massachusetts, have invented certain new and usefulImprovements in the Process of Utilizing the Exhaust of Engines; and Ido hereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use thesame, reference being badto the accompanying drawing, and to the letters of reference markedthereon, which form part of this specification.

This invention has relation to a new and useful method of utilizing theexhaust of enin an injector, with water which has been taken from theworking-boiler and reduced to the pressure of the atmosphere, thetemperature of such Water being still further reduced or not, as may berequired, whereby the exhaust is returned to the boiler, on theprinciple of the injector. A pump may be temporarily used,

as will hereinafter more fully appear, when the current is broken.

Reference being bad to the accompanying drawing, which shows a sideelevation, and

' partly in section, of my improved apparatus,

A is the boiler or vessel, and B the engine. G is the superheater; D,the injector, located between the superheater and the boiler. E is thecooling-tank for the reception of the boilerwater, which is subjectedand reduced to atmospheric pressure and cooling action before its beingutilized as injection-water.

It is well known that in operating injectors they are subject tointermittent action where there is much jar or concussion-such as on 10-comotives, marine engines, and the like-and when this intermittentaction takes place it breaks the current, and thus destroys for the timebeing the regular action of the injector, when the pump has to beresorted to. For this reason I also provide a pump, F, which may be usedas necessity may suggest. The boiler and superheater are each providedwith a furnace for maintaining in them the required temperature.

a is the live-steam pipe to the engine, and 1) its exhaust, which leadsto the superheater, where its temperature is increased, and thenconveyed through pipe cto the injectorD into the boiler, as willpresently be explained.

01 is the pipe that supplies the water-tank with water from the boiler,and f the waterpipe to the injector, which terminates therein, and whichwater, being in a comparatively cool state, is injected into the boilerwith the superheated exhaust of the engine.

When the pump is to be used under the conditions before described, thecock 1 is closed and cooks 2 and 3 opened. Steam is let on to the pumpthrough pipe g and exhausted through It into the main exhaust-pipe. Thepump now being in operation, valve 2 on pipe 0' is opened andwater-flows from tank E. Valve 3 on pipe p'is also opened, so that thepumped water comes in contact with the superheated exhaust in theinjector and forces the entire mixture into the boiler.

I have in another application set forth the methodof taking water fromthe boiler and cooling it for the purpose of injecting the exhaustingsteam by its own force without superheatiug it; but in thisinstance Iprefer to superheat the exhaust before using it in an injector forinjecting itself into the boiler from which it came.

Having thus described my invention, what I claim as new is- 1. Theprocess herein described, consisting in first taking water from theworking-boiler, then cooling it by exposing it to the atmosphere orotherwise, then superheating the exhaust of the engine, and thenbringing the water from the boiler and the steam from the enginetogether in the injector and forcing the entire mixture into the boilerfrom whence it came, on the principleof theinjector,nnder the Intestimony that I claim the foregoing as conditions named. my owninvention I at'fix my signature in pres- 2. The combination of means forutilizing ence of two witnesses.

the exhaust of engines, consisting of the 0001- DAVID RENSHAW. 5ing-vessel, the injector or pump, the super- Witnesses:

heater, and the exhaust-pipes, with interven- B. F. MoRsELL ingmechanism, as described. v EUGENE D. OARUsI.

